Piston packing



Sept ,2 a 11924.. 11,506,855

B. C. M CLURE PISTON PACKIHG Filed June 24,, 1922 A TTOR/VEV il atentedSept. 2, 1924.

STTES 1,506,85 PATEN oFFcE.

BENJAMIN CARL MCOLURE, OF HARTSDALE, NEW YORK, ASSIGNOR TO JOHNS-MANVILLE INCORPORATED, A CORPORATION OF NEW YORK.

PISTON PACKING.

Application filed June 24, 1922. Serial No. 570534.

T 0* all whom it may concern:

Be it known that I, BENJAMIN G. M0- CLURE, a citizen. of the UnitedStates of America, residing at Hartsdale, in the county of WVestchesterand State of New York, have invented certain new and useful Improvementsin Piston Packings, of which the following is a specification.

My invention relates to packing as particularly designed for use forpacking stuifing boxes for piston rods in ammonia pumps, although it maybe used as a packing for pistons or for piston rods in other apparatus.My invention is an improvement on the type of packing illustrated in myprior Patent No. 1,321,930, dated November 18, 1919.

The best form of my invention at present known to me is illustrated inthe accompanying sheet of drawings, in which- Fig. 1 is an axialcross-section through a stuffing box, with parts broken away, thepacking being shown in operative position; and

Fig. 2 is a cross section of a packing ring, parts being broken away anda minor modification being illustrated on an enlarged scale.

Throughout the drawings like reference figures indicate like parts.

1 is a flexible sheet of lead on which has been superposed a sheet oftextile fabric, 2, preferably asbestos cloth,and the composite structureso formed folded back and forth upon itself, as clearly indicated in thedrawing, to form a core for a packing ring. Said core is enclosed in awrapping 3, also preferably formed of asbestos cloth, and this wrappingmay be an extension of the sheet 2 forming part of the core, as shown inFig. 2, or said wrapping may consist of a separate sheet of cloth, asindicated in Fig. 1.

The packing so formed has a continuous sheet of lead folded back andforth in its core and extending the entire length thereof, so that whena proper length to fit a given piston rod is cut off and the packingbent into a circle with abutting ends, this continuous sheet of leadextends all the way around the circumference of the ring, bein brokenonly at the butt joint. The convo utions of the lead should also extendcontinuously around the circle, except at the meeting faces of the jointwhere they abut.

When a ring formed of my packing is placed in stufling box 6 around apiston rod 5, preferably with the folds of the lead sheet parallel tothe axis of the piston rod, as shown in Fig. 1, and said packing iscompressed by screwing down the bolts 8 on the gland 7, a most efficientpacking of the piston rod by a practically continuous sheet of leadresults.

Such packing is impervious to ammonia gases and vapors, 01- to othergases and vapors, except of course those which might have a highlycorrosive action on lead.

The advantages of my invention comprise its impervious feature abovedescribed, and its great durability. The particularly tight fit of thepacking on the surface of the piston rod and on the wall of the stufiingbox results from the pressure of the stufling box gland tending tobuckle or spread the folds of the convolutions of the lead sheet, and aswear of the inner surface of the packing ring occurs, this can be takenup by screwing the gland down further to further force apart or buckleradially the convolutions of the said lead sheet.

Having described my invention, I claim:

1. A packing for ammonia pumps and the like apparatus, which comprises asheet of lead and a sheet of textile fabric superposed thereon, the twobeing folded back and forth to form a core, and a wrapping enclosingsaid core formed of textile fabric, the folds of the core materialextending crosswise of the core, whereby, when a given length of thecompleted packing is bent into a circle with the ends of the packingbody abutting, a continuous sheet of lead with convolutions extendingfrom the butt joint circumferentially around the circle, is formed inthe core.

2. A packing for ammonia pumps and the like apparatus, which comprises asheet of lead and a sheet of asbestos cloth superposed thereon, the twobeing folded back and forth to form a core, and a wrapping enclosingsaid core formed of asbestos cloth comprising an extension of the clothin the core, the folds of the core material extending crosswise of thecore, whereby, when a given length of the completed packing is bent intoa circle with the ends of the packing body abutting, a continuous sheetof lead with convolutions extending from the butt jointcircumferentially around the circle, is formed in the core.

BENJAMIN CARL MoCLURE.

Witnesses:

HARRY W. PORTER, H. A. KIESELBACH

